Histological structure of the musculus longissimus lumborum et thoracis in pigs with the same ryanodine receptor genotype (CC) in relation to carcass indicators
2007
Elias, Z.,Slovenska Polnohospodarska Univ., Nitra (Slovak Republic) | Hluchy, S.,Slovenska Polnohospodarska Univ., Nitra (Slovak Republic) | Mlynek, J.,Slovenska Polnohospodarska Univ., Nitra (Slovak Republic)
Sixteen pigs of about 101.28 kg live weight were used to investigate the histological structure of their musculus longissimus lumborum et thoracis (MLLT) in relation to carcass value indicators. The animals received a standard diet fortified with vitamin-mineral mixture. Samples from the MLLT for histological evaluation were taken within 30 minutes post mortem, immediately frozen in liquid N and stored at a temperature of -20 deg C. Samples were processed histochemically and muscle fibres were differentiated according to reactions on SDH on the basis of Vacek's (1974) method. Nikon microscopic system, Pixelink digital camera and LUCIA software for the morphometric analysis of MLLT structure were used. White muscle fibres (WMF) were the most abundant, whereas intermediate muscle fibres were the least abundant. Red muscle fibres (RMF) abundance was only slightly higher than that of intermediate muscle fibres. WMF had also the biggest diameter, whereas RMF had the lowest one. Positive correlations were obtained between WMF abundance and loin meat weight, thigh meat weight, carcass length, ribcase length, right half weight, valuable meat cuts weight, thigh weight, thigh percentage in the half-carcass, and MLLT area. Negative correlations were calculated between WMF abundance and both fat content and weight. RMF content showed positive correlations with shoulder fat weight, neck meat weight, neck fat weight, head weight, thigh fat weight, average backfat thickness and MLLT area.
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